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After the awakening of the ancient primal Zerg Zurvan, he told Kerrigan that she needed to be reborn to become Queen of Blades once more. She must seek out the first spawning pool that first created the Zerg.

The site was fought over by the now-leaderless Brakk's Pack, as well as Yagdra and his pack. Eventually Brakk's Pack was defeated, and then Kerrigan and her Swarm held off Yagdra's pack long enough for Kerrigan to emerge, reborn as the Primal Queen of Blades.

In the first part of the stage the player must guide Kerrigan to the checkpoint, where she will enter the chrysalis to begin her transformation. The new unit for the mission is the swarm host. Note that unlike the multiplayer game, in the campaign swarm hosts do not burrow, they root, meaning they can be seen and attacked. Against numerous enemies this means their locusts may be overwhelmed and the swarm host left defenseless. The player should mix spine crawlers with swarm hosts to create a strong ground defense.

The player will have several minutes to build up their forces before their base is attacked. There is an expansion to the east that should be seized early, it is high enough north that the primal zerg will likely not find it and it will be safe for most of the mission. The player should focus on whatever manner of defense they prefer. Mutalisks, being able to quickly fly between chokepoints, are helpful, but the other strains of the zerg the player has acquired are just as effective. The player can take advantage of the high ground to plant spine crawlers along the cliffs to attack the primal zerg as they pass below.

The player will be attacked regularly by primal zerg both from the east and west, along with an occasional handful of mutalisks attacking from the south. The southern chokepoint is blocked by rocks, later in the mission the primal zerg will begin attacking this chokepoint as well, breaking down the rocks to do so. The primal zerg attack in great numbers, so the player should be ready with a large army of their own and upgrade them fully. Partway through the mission, Abathur will inform Zagara of primal essences in the pool that allow it to spawn a large number of locusts. This invincible, flying locusts will automatically seek out enemies in a radius around the player's base, and the summoning of them regenerates quickly. If the player wishes to use the locusts, they should do so as the enemy moves in, as it will take the locusts time to arrive and attack after spawning around the pool.

During the mission Abathur detects a tyrannozor in the southern part of the map. Throughout the level primal zerg war across the south, cutting off access to the tyrannozor's lair. If moving in with ground forces, at least 3-4 Swarm Hosts should be all the player needs to keep the tyrannozor occupied and deal with any other creatures that spawn around it while it is still alive. The player should watch for a break in the endless stream of primals and move the swarm hosts in there so their locusts can kill the tyrannozor with no risk of lost expenses. Mutalisks on the other hand can fly over the primals and attack the tyrannozor directly; large numbers of them (16-20+) and sundering glaive are a must however. Killing it grants an additional Kerrigan level.

With only a few minutes left in the mission, the primal zerg will stage an all-out attack on the hive cluster from all directions. The player should anticipate this and use the locusts at this time, and pull their defenders back to protect the chrysalis during these final moments. As long as the chrysalis stands when the timer finishes, the mission will be won, the loss of the player's expansion or main base is irrelevant.

When playing on Brutal difficulty, players will need to be ready to deal with considerable numbers of Primal Ultralisks, which can deal with Locusts fairly easily. Mutalisks with Sundering Glaive are the ideal counter, but may be hard to amass early on. Swarmlings with Hardened Carapace and Vile Roaches will help a great deal against the Ultralisks. Players will also have to watch out for Vipers, which can suppress their static defenses.

The original objective of the mission was to kill a set amount of primal zerg. There was also going to be an artificial dam you could destroy that would heal your minions because of Kerrigan's healing influence.[2]Dehaka was to also play a part in the mission.[3]

If Old Soldiers is completed before going to Zerus, Zagara will take control of the zerg broods while Kerrigan is being transformed. Otherwise, Izsha will take control of the zerg broods.